'''AT&T Corp.''', originally the '''American Telephone and Telegraph Company''', is the subsidiary of AT&T
that provides voice, video, data, and Internet
telecommunications and professional services to business
s, and government agencies. During its long history, AT&T was at times the world's largest telephone
company, the world's largest cable television
operator, and a regulated monopoly
. At its peak in the 1950s and 1960s, it employed one million people and its revenue was roughly $3 billion annually.
In 2005, AT&T was purchased by Baby Bell
SBC Communications for more than $16 billion ($ in present-day terms). SBC then rebranded itself as AT&T|AT&T Inc.
Today, AT&T Corporation continues to exist as the long distance calling|long distance subsidiary
of AT&T Inc., and its name occasionally shows up in AT&T press releases.